Reference to 'X' is ambiguous

Question

After several changes to my project I suddenly get this build error:

Reference to \'kCGImageAlphaPremultipliedLast\' is ambiguous

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Answer 1

Well some solutions here are nice but use_frameworks! is exactly what I need now even thou it made this problem happening. But it looks like build does not like when I use frameworks and header is referenced twice like this

#import "TSMessage.h"
#import "TSMessage+CSExtension.h"

but problem gets away when it compiles like this

#import "TSMessage+CSExtension.h"